359 citations · 4.5k across the 87 of their papers we have counts for
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Non-Gaussian Statistics of Nanohertz Stochastic Gravitational Waves
Xiao Xue, Zhen Pan, Liang Dai
Recent detection of nHz stochastic gravitational wave background (SGWB) by multiple pulsar timing arrays (PTAs) has stimulated intensive discussions about its physical origin. In p…
Dark Matter distinguished by skewed microlensing in the "Dragon Arc"
Tom Broadhurst, Sung Kei Li, Amruth Alfred +18
Microlensed stars recently discovered by JWST & HST follow closely the winding critical curve of A370 along all sections of the ``Dragon Arc" traversed by the critical curve. These…
Imaging dark matter at the smallest scales with lensed stars
J. M. Diego, Sung Kei Li, Alfred Amruth +19
Observations of caustic-crossing galaxies at redshift show a wealth of transient events. Most of them are believed to be microlensing events of highly magnified stars. Ea…
Detecting Dark Matter Substructures on Small Scales with Fast Radio Bursts
Huangyu Xiao, Liang Dai, Matthew McQuinn
We propose measuring the arrival time difference of Fast Radio Bursts (FRBs) along two adjacent sightlines as a new probe to dark matter substructures on scales down to A…
Under Einstein's Microscope: Measuring Properties of Individual Rotating Massive Stars From Extragalactic Micro Caustic Crossings
Xu Han, Liang Dai
Highly magnified stars residing in caustic crossing lensed galaxies at z ~ 0.7-1.5 in galaxy cluster lensing fields inevitably exhibit recurrent brightening events as they traverse…
JWST's PEARLS: Mothra, a new kaiju star at z=2.091 extremely magnified by MACS0416, and implications for dark matter models
J. M. Diego, Bangzheng Sun, Haojing Yan +28
We report the discovery of Mothra, an extremely magnified monster star, likely a binary system of two supergiant stars, in one of the strongly lensed galaxies behind the galaxy clu…
Testing charge quantization with axion string-induced cosmic birefringence
Weichen Winston Yin, Liang Dai, Simone Ferraro
We demonstrate that the Peccei-Quinn-electromagnetic anomaly coefficient can be directly measured from axion string-induced cosmic birefringence by applying scattering…
Magnetic Fields from Compensated Isocurvature Perturbations
Jordan Flitter, Cyril Creque-Sarbinowski, Marc Kamionkowski +1
Compensated isocurvature perturbations (CIPs) are perturbations to the primordial baryon density that are accompanied by dark-matter-density perturbations so that the total matter…
Gravitational wave lensing as a probe of halo properties and dark matter
Giovanni Tambalo, Miguel Zumalacárregui, Liang Dai +1
Just like light, gravitational waves (GWs) are deflected and magnified by gravitational fields as they propagate through the Universe. However, their low frequency, phase coherence…
JWST's PEARLS: Prime Extragalactic Areas for Reionization and Lensing Science: Project Overview and First Results
Rogier A. Windhorst, Seth H. Cohen, Rolf A. Jansen +82
We give an overview and describe the rationale, methods, and first results from NIRCam images of the JWST "Prime Extragalactic Areas for Reionization and Lensing Science" ("PEARLS"…
Detecting Cosmic Strings with Lensed Fast Radio Bursts
Huangyu Xiao, Liang Dai, Matthew McQuinn
Correlated red noise recently reported from pulsar timing observations may be an indication of stochastic gravitational waves emitted by cosmic strings that formed during a primord…
Probing cosmic strings by reconstructing polarization rotation of the cosmic microwave background
Weichen Winston Yin, Liang Dai, Simone Ferraro
Cosmic birefringence -- the rotation of the polarization of the cosmic microwave background (CMB) photons as they travel to the Earth -- is a smoking gun for axion-like particles (…
Gravitational Lensing Signatures of Axion Dark Matter Minihalos in Highly Magnified Stars
Liang Dai, Jordi Miralda-Escudé
Axions are a viable candidate for Cold Dark Matter (CDM) which should generically form minihalos of sub-planetary masses from white-noise isocurvature density fluctuations if the P…
Spectral Distortions of the CMB as a Probe of Inflation, Recombination, Structure Formation and Particle Physics
J. Chluba, A. Kogut, S. P. Patil +98
Following the pioneering observations with COBE in the early 1990s, studies of the cosmic microwave background (CMB) have focused on temperature and polarization anisotropies. CMB…
Pulsar-timing arrays, astrometry, and gravitational waves
Wenzer Qin, Kimberly K. Boddy, Marc Kamionkowski +1
We discuss the theory of pulsar-timing and astrometry probes of a stochastic gravitational-wave background with a recently developed "total-angular-momentum" (TAM) formalism for co…
Implication of the Shape of the EDGES Signal for the 21 cm Power Spectrum
Alexander A. Kaurov, Tejaswi Venumadhav, Liang Dai +1
We revisit the 21 cm power spectrum from the epoch of cosmic dawn in light of the recent EDGES detection of the 21 cm global signal at frequencies corresponding to . The s…
Heating of the intergalactic medium by the cosmic microwave background during cosmic dawn
Tejaswi Venumadhav, Liang Dai, Alexander Kaurov +1
The intergalactic medium is expected to be at its coldest point before the formation of the first stars in the universe. Motivated by recent results from the EDGES experiment, we r…
Probing Dark Matter Subhalos in Galaxy Clusters Using Highly Magnified Stars
Liang Dai, Tejaswi Venumadhav, Alexander A. Kaurov +1
Luminous stars in background galaxies straddling the lensing caustic of a foreground galaxy cluster can be individually detected due to extreme magnification factors of …
Microlensing of Extremely Magnified Stars near Caustics of Galaxy Clusters
Tejaswi Venumadhav, Liang Dai, Jordi Miralda-Escudé
Recent observations of lensed galaxies at cosmological distances have detected individual stars that are extremely magnified when crossing the caustics of lensing clusters. In idea…
Insights from probability distribution functions of intensity maps
Patrick C. Breysse, Ely D. Kovetz, Peter S. Behroozi +2
In the next few years, intensity-mapping surveys that target lines such as CO, Ly, and CII stand to provide powerful probes of high-redshift astrophysics. However, these line em…
Effect of lensing magnification on the apparent distribution of black hole mergers
Liang Dai, Tejaswi Venumadhav, Kris Sigurdson
The recent detection of gravitational waves indicates that stellar-mass black hole binaries are likely to be a key population of sources for forthcoming observations. With future u…
Lensing of Fast Radio Bursts as a Probe of Compact Dark Matter
Julian B. Muñoz, Ely D. Kovetz, Liang Dai +1
The possibility that part of the dark matter is made of massive compact halo objects (MACHOs) remains poorly constrained over a wide range of masses, and especially in the $20-100\…
Search for Compensated Isocurvature Perturbations with Planck Power Spectra
Julian B. Muñoz, Daniel Grin, Liang Dai +2
In the standard inflationary scenario, primordial perturbations are adiabatic. The amplitudes of most types of isocurvature perturbations are generally constrained by current data…
Antisymmetric galaxy cross-correlations as a cosmological probe
Liang Dai, Marc Kamionkowski, Ely D. Kovetz +2
The auto-correlation between two members of a galaxy population is symmetric under the interchange of the two galaxies being correlated. The cross-correlation between two different…